Published July 10, 2016
| Published + Submitted
Journal Article
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Measurement of spin correlations in tt production using the matrix element method in the muon+jets final state in pp collisions at √s = 8 TeV
Abstract
The consistency of the spin correlation strength in top quark pair production with the standard model (SM) prediction is tested in the muon+jets final state. The events are selected from pp collisions, collected by the CMS detector, at a centre-of-mass energy of 8 TeV, corresponding to an integrated luminosity of 19.7 fb^(−1). The data are compared with the expectation for the spin correlation predicted by the SM and with the expectation of no correlation. Using a template fit method, the fraction of events that show SM spin correlations is measured to be View the MathML source0.72±0.08(stat)_(−0.13)^(+0.15)(syst), representing the most precise measurement of this quantity in the muon+jets final state to date.
Additional Information
© 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Received 19 November 2015. Received in revised form 14 March 2016. Accepted 2 May 2016. Available online 6 May 2016. Editor: M. Doser. Funded by SCOAP3. We thank Werner Bernreuther for kindly providing the LO matrix elements describing tt production and subsequent decay in the μ+jets channel, valid for both on-and off-shell top quarks. We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centres and personnel of the Worldwide LHC Computing Grid for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC and the CMS detector provided by the following funding agencies: BMWFW and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croatia); RPF (Cyprus); MoER, ERC IUT and ERDF (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); LAS (Lithuania); MOE and UM (Malaysia); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal); JINR (Dubna); MON, RosAtom, RAS and RFBR (Russia); MESTD (Serbia); SEIDI and CPAN (Spain); Swiss Funding Agencies (Switzerland); MST (Taipei); ThEPCenter, IPST, STAR and NSTDA (Thailand); TUBITAK and TAEK (Turkey); NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie programme and the European Research Council and EPLANET (European Union); the Leventis Foundation; the A.P. Sloan Foundation; the Alexander von Humboldt Foundation; the Belgian Fed-eral Science Policy Office; the Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture (FRIA-Belgium); the Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium); the Ministry of Education, Youth and Sports (MEYS) of the Czech Republic; the Council of Scientific and Industrial Research, India; the HOMING PLUS programme of the Foundation for Polish Science, cofinanced from European Union, Regional Development Fund; the OPUS programme of the National Science Centre(Poland); the Compagnia di San Paolo (Torino); MIUR project 20108T4XTM (Italy); the Thalis and Aristeia programmes cofi-nanced by EU-ESF and the Greek NSRF; the National Priorities Research Program by Qatar National Research Fund; the Rachadapisek Sompot Fund for Postdoctoral Fellowship, Chulalongkorn University (Thailand); and the Welch Foundation, contract C-1845.Attached Files
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Submitted - 1511.06170v2.pdf
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Additional details
- Alternative title
- Measurement of spin correlations in t t-bar production using the matrix element method in the muon + jets final state in pp collisions at sqrt(s) = 8 TeV
- Eprint ID
- 68939
- Resolver ID
- CaltechAUTHORS:20160711-064720149
- Bundesministerium für Wissenschaft, Forschung und Wirtschaft (BMWFW)
- Austrian Science Fund (FWF)
- Fonds de la Recherche Scientifique (FNRS)
- Fonds Wetenschappelijk Onderzoek - Vlaanderen (FWO)
- Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
- Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
- Fundação de Amparo à Pesquisa do Estado de Sao Paulo (FAPESP)
- Bulgarian Ministry of Education and Science (MES)
- CERN
- Chinese Academy of Sciences
- Ministry of Science and Technology (China)
- National Natural Science Foundation of China
- COLCIENCIAS (Colombia)
- Croatian Ministry of Science, Education and Sport
- Croatian Science Foundation
- Research Promotion Foundation, Cyprus
- Ministry of Education and Research, Estonian Research Council via IUT
- European Regional Development Fund, Estonia
- Academy of Finland
- Ministry of Education and Culture (Finland)
- Helsinki Institute of Physics
- Commissariat à l'Énergie Atomique et aux Énergies Alternatives (CEA) France
- Centre National de la Recherche Scientifique (CNRS)
- Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)
- Bundesministerium für Bildung und Forschung (BMBF)
- Deutsche Forschungsgemeinschaft (DFG)
- Hermann von Helmholtz-Gemeinschaft Deutscher Forschungszentren (HGF)
- General Secretariat for Research and Technology (GSRT)
- Hungarian National Scientific Research Fund (OTKA)
- National Innovation Office (Hungary)
- Department of Atomic Energy (India)
- Department of Science and Technology (DST) (India)
- Institute for Studies in Theoretical Physics and Mathematics, Iran
- Science Foundation, Ireland
- Istituto Nazionale di Fisica Nucleare (INFN)
- Ministry of Science, ICT and Future Planning (Korea)
- National Research Foundation of Korea
- Lithuanian Academy of Sciences
- Ministry of Education (Malaysia)
- Universiti Malaya (Malaya University, Malaysia)
- CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico)
- Ministry of Business, Innovation and Employment, New Zealand
- Pakistan Atomic Energy Commission
- Ministry of Science and Higher Education (Poland)
- NSC (Poland)
- Fundação para a Ciência e a Tecnologia (FCT)
- Joint Institute for Nuclear Research (JINR)
- MON
- RosAtom
- Russian Academy of Sciences
- Russian Foundation for Basic Research
- Ministry of Education, Science and Technological Development of Serbia
- SEIDI and CPAN (Spain)
- Swiss Funding Agencies (Switzerland)
- Ministry of Science and Technology (Taipei)
- ThEPCenter, IPST, STAR, and NSTDA (Thailand)
- Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)
- Türkiye Atom Enerjisi Kurumu (TAEK)
- National Academy of Sciences of Ukraine
- State Fund for Fundamental Researches, Ukraine
- Science and Technology Facilities Council (STFC)
- Department of Energy (DOE)
- NSF
- Marie-Curie programme and the European Research Council and EPLANET (European Union)
- Leventis Foundation
- Alfred P. Sloan Foundation
- Alexander von Humboldt Foundation
- Belgian Federal Science Policy Office
- Fonds pour la Formation à la Recherche dans l'índustrie et dans l'Ágriculture (FRIA-Belgium)
- Agentschap voor Innovatie door Wetenschap en Technologie (IWT-Belgium)
- Ministry of Education, Youth and Sports (MEYS) of the Czech Republic
- Council of Scientific and Industrial Research of India
- HOMING PLUS programme of Foundation for Polish Science
- European Union Regional Development Fund
- OPUS programme of the National Science Center (Poland)
- Compagnia di San Paolo (Torino)
- 20108T4XTM
- Ministero dell'Istruzione, dell'Università e della Ricerca (MIUR)
- Thalis programme
- Aristeia programme
- European Union European Social Fund
- Greek NSRF
- Qatar National Research Fund National Priorities Research Program
- Rachadapisek Sompot Fund for Postdoctoral Fellowship Chulalongkorn University (Thailand)
- C-1845
- Welch Foundation
- SCOAP3
- Created
-
2016-07-11Created from EPrint's datestamp field
- Updated
-
2021-11-11Created from EPrint's last_modified field
- Caltech groups
- CMS@Caltech